Lecture 13 - Comm 88 Lecture I Problems with Participants(Cont A Effects related to pre-testing 1 Testing/Sensitization effect a Could give you an

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November 13, 2008 Comm. 88 Lecture I. Problems with Participants (Cont.) A. Effects related to pre-testing: 1. Testing/Sensitization effect a. Could give you an idea of what study is about. b. Begin to learn more about the topic. c. Start thinking about it and talk to people about it. 2. Maturation a. Scores change as people mature and learn more b. Does not have be literal aging, just change 3. Mortality (attrition) a. When people drop out of the study b. Threat to internal validity and threat to pre-testing because people cannot drop out from pre-test to actual test. B. How to control these problems? 1. Again, RA (random assignment) to proper conditions! II. Problems with Procedure A. Selection Bias 1. Threat to internal validity because the explanation of the results has to do with the people in your study themselves. a. Individual difference 2. The way you grouped people in your study. a.
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This note was uploaded on 01/20/2010 for the course COMM comm10 taught by Professor Klein during the Spring '10 term at West Valley.

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Lecture 13 - Comm 88 Lecture I Problems with Participants(Cont A Effects related to pre-testing 1 Testing/Sensitization effect a Could give you an

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